I really want to say Thank You! for showing us all your crazy, funny, useful, interesting, whatever creations, modifications, hacks or plans and ideas. I'm sure you're fueling many of our creative mad scientist inner selves. I love that you're so open about idea's that didn't work out(yet) and that you reach out to your community for help, like so many of us turn to you with our own questions. Seriously, what you are doing is great, please keep on doin' what you're doin'. Thank you.
BTW, that trick of putting a transformer in series also works great for modulating a He-Ne laser. I once tried it with a PA transformer connected backwards to the 8-ohm speaker output of a hi-fi, and the modulation was such that you could actually see the intensity variation.
With a laser diode it's simipler to inject the signal directly into the driver without the need for a transformer. Actually it's possible with a HeNe as well, but a bit more complicated.
interestingly you can do the reverse and create a laser microphone by shining a lazer through a room and then playing the signal you get from a photo diod on a speaker
What if you power a magnetron that way? Would it be FM or AM? You have the DC supply and than you add another microwave oven transformer in series, than pump the desired signal in to the primary of the second transformer... That'd be one cheap ass power amp!
Eviltech Heh, neat one ;-) Probably AM, because the actual frequency of operation of a cavity magnetron (the type used in a microwave oven) is determined by the dimensions of the cavities inside the tube (although accelerating voltage probably would have a slight effect).
Hi Ray. Just a quick note of appreciation for your videos. It's such a great pleasure to listen to someone who knows his subject inside and out, and can put the information over with such an easy-going wit and charm. Your pirate radio stories, in particular are priceless.
Man whenever you start talking about the electronics behind it, capacitor here, oscillator there and show some circuit layout I'm just lost :D I still love watching your stuff, but that to me is just magic you do because you're a wizard...
I am not an electrical engineer, rather, I spent 8 years in a math department as a student, but I did stumble on some nice addendums to Ben's transmitter that you may be very aware of. First a disclaimer, you may only want to make the last modification if your lost in an Amazon jungle and need a transmitter with a bit of range, otherwise, you have built a device that can run contrary to FCC part 15 regulations. I originally did not have a 'can' oscillator, so I used a 555 timer and although it works with reasonable audio the canned oscillator is a nicer choice and I ordered one. I did not see Ben's diagram on my mobile internet, so I used a standard configuration with an audio transformer for modulation as in Ben's design. At the output I placed a hand wound coil/inductor having an inductance of .25 mH in series with a 50 K ohm pot that then connects to ground. When the pot is at a setting in ohms that I forgot to make note of the open circuit voltage is maxed at roughly 16 volts peak to peak. Without the coil and pot I only had roughly 4 volts peak to peak. The power source I used to drive the 'can' oscillator was 4 double A batteries in series. Additionally the coil/inductor reshaped the output from square wave into sine wave. I next measured the output impedance of the device by measuring the output open circuit voltage and then the output voltage with a 10 K load resistor with my scope and by performing the calculation discovered when the voltage was maximized by the adjustment of the pot the output impedance was 7.7 K ohms. From this I calculated that for a coil/inductor used as an antenna I would need the inductor to have 1.24 mH for its inductance in order to have its impedance match the transmitters output impedance. I then wrapped, close wound, 24 MAWG wire around an 8 inch by 11 inch cardboard box. The number of turns I used was 47 which gave me very close to an inductance for the antenna of 1.24 mH. I then direct connected the antenna to the transmitter with no need for a capacitor because the coil antenna was designed to only be a perfect match at 1000 Khz Once connected I briefly turned on the transmitter to see if I was spot on with my assumptions or out in left field. Apparently I was spot on because the output across the coil antenna read 8 volts peak to peak exactly as it should were the antenna a perfect impedance match for the transmitter. From the measurements made I will determine the transmitter's power which I am reasonably sure is in the mW range. Once this is known, should the transmitter exceed Part 15 regulations then by adjusting the 50 K pot I can bring the transmitter within FCC guidelines, but still maintain the maximum range for use as a device to transmit audio books which had been the aim of the entire endeavor.
All that AM Tx needs now is some sort of sensor that can detect when you're driving under bridges and whatnot and have it reduce the output of the Tx until you get static.
Ben, I know this comment is ~2 years late, but those Superpressure fittings are really nice to use in extreme pressure set-ups. I look forward to seeing what you come up with for your extreme pressure chamber. This is the second time that I've watched this video, so I hope that I didn't write the same comment a year or two ago!
I saw this video at random. I found it very cool but over my head. I build cars and trucks and have three with original am radios. I would love to hear music like that come from them. thanks
Wow, so you're really giving the anodizing thing a shot! I hope it works! You probably ran into the paper below already, but in case you didn't, I think it clarifies quite a bit about the process. Great video, btw -- I didn't know AM modulation could be this simple. G.E. Thompson, "Porous anodic alumina: fabrication, characterization and applications", Thin Solid Films 297 (1997) 192-20.
Great project. Love the MP3 FM radio. Thanks for the tip. I would put a simple pi filter on the output of the oscillator to knock down any harmonics. I know its low power. But, if it can get you into trouble somehow, it probably will. Or not. That loop through junction means you are broadcasting to nearby cars from the truck's antenna. Just thinking out loud.
I'd say be careful to not interfere with other people's radio when transmitting, especially if you have harmonics, but from the sounds of it you'd just be giving them better radio to listen to anyway! :) Nice explanations.
RimstarOrg it's only powerful enough to work from a few feet away. It wouldn't even work to the cat next to you at a stop light. otherwise, it would be illegal.
ricarleite A lot will depend upon how much of the oscillator's square wave remains, and hence the harmonics, though I would expect the transformer to largely smooth that out into much more of a sine wave. One will want to ensure that they are well within the emissions limits, both power and purity wise, for unlicensed transmitters (FCC part 47 IIRC) though it is likely fine if the maximum swing is a volt or less (but I haven't done the math either, nor do I know the total impedance to make the calculation properly). I would likely be more concerned with the DC-DC converter in his truck (the silver module sitting atop the speaker) as I know they produce a lot of RFI as I use one to produce the 19V I need to run a pair of 27" HD monitors for my amateur radio shack where everything runs entirely off of a large 12V battery bank. I had to include a good deal of filtering to clean up its switching transients in the LF through HF brands as well as some LC ringing up in the VHF range at around 80MHz and I could pick up the emissions on my dual band general coverage HT from several tens of feet away. But after filtering it is absolutely quiet now with no detectable RFI escaping my filter and chassis and has worked beautifully.
Yes. It is fantastic! I've posted a couple short vids to twitter, but will wait until the Kickstarter for a full RUclips video. I saw that you have one as well -- your high-speed bullet footage must be really great!
I started using it the day after I got it, even before I got the batteries for it. I didn't realize the little cap on the body was an ADAPTER so I shot everything without it. I asked David why I could ONLY focus on stuff when the lens was zoomed all the way. lol I thought the lens was broken because the one he sent had a dent. I'm eager to see what others can do with the camera.
That is SO CREEPY, when you showed the picture of your truck, what went through my mind was moonlight serenade, then you played it to test your transmitter. Ugh I have goosebumps now.
There are commercial option for this, maybe not as fun as making one from scratch but much more accessible for people who aren't operating at the upper end of the skill curve. It's called SSTran. I use it to broadcast Old Time Radio MP3s through my restored wooden radios.
if your only using one channel out of the mp3 player module, stereo audio will sound missing/hollow - i modded one in to a flight remote control, with speakers replacing the sticks, they're great, got one with bluetooth built in too.
I threw together a transmitter like that one Friday afternoon, when I needed to trace a cable inside a wall. You can just couple the signal into the live wall socket or whatever with Y caps. I think I used a 555 to create the modulating tone for the oscillator module.
You need to mix in some old-timey radio advertisements and announcer breaks with the music mp3 files to really get that 30s AM radio feel. Maybe some Roosevelt fireside chats to listen to?
These MP3 / FM modules are also able to play PCM WAV files at 44,1Khz 16 Bit. So you're not limited to to MP3 / WMA and FM Radio. You could play linear PCM WAV files from the SD card and USB port.
the problem with the inline setup you have there is that the signal wont just go into your radio but will also be radiated back up the antenna lead and out of the antenna
Great project! (The truck's pretty boss, too). You should set it up so the AM-P3 transmitter turns on/off with the radio itself. First solution that comes to mind is a relay in series with the radio's VBAT line. Also, I would like to see more about the radio restoration itself (or was that covered on one of your other media outlets?)
That anodizing idea is pretty neat, but I have an even better suggestion: experiments at my University have shown that superior adhesive joint bond strength is obtained by boiling the aluminium in MilliQ water. This creates an even more columnar topography and suits adhesive bonding much better than any other surface treatment out there. the only reason it isn't used widely is that industry will struggle to keep contaminants out of the process and ultra high purity water.
Funny deja vu for me: I also made such an AM transmitter a long time ago but used an NPN transistor and resistor at the output for the modulation. Never thought that those were even stable when modulating the supply directly.
I've played with this oscillator-can-as-a-transmitter idea a fair bit,and it actually works fairly well. There's a circuit with an LM386 to modulate the power to the oscillator can,also. It can be tricky to find the oscillators in 'useful' frequencies though. (unless your local AM market is completely dead,and 1000khz is clear.)
you never disappoint especially since you leave us wanting more and the about a month wait. I don't mind it's worth it to see cool projects like yours. Also with the gecko tape have you gotten any adhesion or just abnormally low adhesion? I had an idea to make my own by focusing a dot matrix onto photo resist, etching copper, and casting that. I would try that I'd the anodized aluminum doesn't work but you seem like you know much more than I do about this.
Very wise keeping a fire extinguisher in a any classic car! they can and do catch of fire from time to time. I observed a 1950's corvette burning up due to an electrical issue. It could of been prevented.
The LM324 has an output voltage range of 0 to V-1.5, and the input high is V-2. Since you set the gain to 2 and the input voltage swings around 1.5v, I think you're probably losing some modulation, the modulation is uneven, and the oscillator drive is a bit low. The input is railing at 3v, but after amplification, the 3v is 3.5v and the 1v input is 2v output, leading to about 1.5v of total modulated bandwidth and an asymmetric amplitude. You might want to use an adjustable regulator with a 6.5v output so that you can get full modulation.
You are correct. I had actually used an LM78L09, and only remembered it as a 5V. This is one problem with building something, then only getting time to make a video a month later :)
This is the coolest idea. I was going to hack my old radio and wire an MP3 player with old recordings but I love using the radio exactly as it is so I'm going to try this. Thanks for sharing your ideas. Great truck by the way also.
Wow, that's a really cunning circuit. I bet you could capacitive couple to the adjust pin of an LM317 or the like to an audio signal. Then you wouldn't need the transformer (for that circuit) or need to hack the mp3
Yip and I think a few other channels I'm subscribed to (can't remember who atm it IS 5:20am. Maybe the backyard scientist? ) This guy is doing a good job of getting his products into sight.
Really nice project! You probably should add some input filtering. Car power usually has quite a bit of spikes from inductive elements ranging far outside 12 V. This kills the circuit.
you could hook up an arduino to a pot-meter and make the MP3 player skip through random numbers of songs (pressing next multiple times) simulating changing channels :)
Waaaait, it just struck me. You must know Jeri Ellsworth! A video collaboration would be nice, but unfortunately i don't have a specific topic in mind. I recall she used to do things like hand-make a transistor on her channel, which is not too dissimilar to the kinds of things you do.
I'm excited to watch the video on the cable modem teardown! I know a bit about the network and protocols used, but the hardware/firmware side of things is a mystery to me. Are you planning on taking a low-level approach via assembly language when discussing the firmware, or will it be more of a high-level discussion? As always, your channel continues to amaze. Thanks for sharing your work with us. :)
Really looking forward to those upcoming projects. I absolutely love this channel Ben.
Thanks so much! I've been super busy with work, but will eventually get to these projects.
Woow, do you have another work other than youtube. I thought youtube is your main job. How you had time to built such a lab at home??
not sure what he does now, but i believe a few years ago he ran a home based repair business fixing technical stuff like MRI machines.
bmetal2 From what I've read from the comments here on RUclips, he used to work for Valve Software and currently works for Google X.
I thought Myth Busters would have been a good fit, I reckon Google X is even better
"I wanted an old radio, so I bought a 1938 Ford Pickup." Love it.
that trucks looks really nice!
+1
+1
The truck is not an upcoming project?! Some of us are into cars too!
didgitalpunk fuck all of you
Man its so friggin awesome to see chronos cameras just landing in everyone's lap
This could be really handy as I have a studio full of old AM radios. Thank-you.
I really want to say Thank You! for showing us all your crazy, funny, useful, interesting, whatever creations, modifications, hacks or plans and ideas. I'm sure you're fueling many of our creative mad scientist inner selves. I love that you're so open about idea's that didn't work out(yet) and that you reach out to your community for help, like so many of us turn to you with our own questions. Seriously, what you are doing is great, please keep on doin' what you're doin'. Thank you.
I love your off-the-wall approach to problems. Not everything has to be done by the book using expensive parts. Keep up the good work!
BTW, that trick of putting a transformer in series also works great for modulating a He-Ne laser. I once tried it with a PA transformer connected backwards to the 8-ohm speaker output of a hi-fi, and the modulation was such that you could actually see the intensity variation.
That sounds really cool. I'll bet it would work with modern high-power laser diodes too.
With a laser diode it's simipler to inject the signal directly into the driver without the need for a transformer. Actually it's possible with a HeNe as well, but a bit more complicated.
interestingly you can do the reverse and create a laser microphone by shining a lazer through a room and then playing the signal you get from a photo diod on a speaker
What if you power a magnetron that way? Would it be FM or AM?
You have the DC supply and than you add another microwave oven transformer in series, than pump the desired signal in to the primary of the second transformer... That'd be one cheap ass power amp!
Eviltech Heh, neat one ;-) Probably AM, because the actual frequency of operation of a cavity magnetron (the type used in a microwave oven) is determined by the dimensions of the cavities inside the tube (although accelerating voltage probably would have a slight effect).
Amazed when you said your friend built that high speed camera. It looks great! Can't believe it wasn't factory built.
That's a beautiful truck you have. I love the old music playing over the old radio must be like driving a time machine
Hi Ray. Just a quick note of appreciation for your videos. It's such a great pleasure to listen to someone who knows his subject inside and out, and can put the information over with such an easy-going wit and charm. Your pirate radio stories, in particular are priceless.
Uh, what? His name isn't Ray and he hasn't done any videos on pirate radio. Did you comment on the wrong video?
Your taste in vehicles is impeccable.
Man whenever you start talking about the electronics behind it, capacitor here, oscillator there and show some circuit layout I'm just lost :D I still love watching your stuff, but that to me is just magic you do because you're a wizard...
I felt like I've been waiting a thousand years to see your videos
Admittedly, I can't always follow the content of this channel but it's still very intriguing. love that truck
I am not an electrical engineer, rather, I spent 8 years in a math department as a student, but I did stumble on some nice addendums to Ben's transmitter that you may be very aware of. First a disclaimer, you may only want to make the last modification if your lost in an Amazon jungle and need a transmitter with a bit of range, otherwise, you have built a device that can run contrary to FCC part 15 regulations.
I originally did not have a 'can' oscillator, so I used a 555 timer and although it works with reasonable audio the canned oscillator is a nicer choice and I ordered one.
I did not see Ben's diagram on my mobile internet, so I used a standard configuration with an audio transformer for modulation as in Ben's design. At the output I placed a hand wound coil/inductor having an inductance of .25 mH in series with a 50 K ohm pot that then connects to ground. When the pot is at a setting in ohms that I forgot to make note of the open circuit voltage is maxed at roughly 16 volts peak to peak.
Without the coil and pot I only had roughly 4 volts peak to peak. The power source I used to drive the 'can' oscillator was 4 double A batteries in series. Additionally the coil/inductor reshaped the output from square wave into sine wave.
I next measured the output impedance of the device by measuring the output open circuit voltage and then the output voltage with a 10 K load resistor with my scope and by performing the calculation discovered when the voltage was maximized by the adjustment of the pot the output impedance was 7.7 K ohms. From this I calculated that for a coil/inductor used as an antenna I would need the inductor to have 1.24 mH for its inductance in order to have its impedance match the transmitters output impedance. I then wrapped, close wound, 24 MAWG wire around an 8 inch by 11 inch cardboard box. The number of turns I used was 47 which gave me very close to an inductance for the antenna of 1.24 mH. I then direct connected the antenna to the transmitter with no need for a capacitor because the coil antenna was designed to only be a perfect match at 1000 Khz Once connected I briefly turned on the transmitter to see if I was spot on with my assumptions or out in left field. Apparently I was spot on because the output across the coil antenna read 8 volts peak to peak exactly as it should were the antenna a perfect impedance match for the transmitter.
From the measurements made I will determine the transmitter's power which I am reasonably sure is in the mW range. Once this is known, should the transmitter exceed Part 15 regulations then by adjusting the 50 K pot I can bring the transmitter within FCC guidelines, but still maintain the maximum range for use as a device to transmit audio books which had been the aim of the entire endeavor.
All that AM Tx needs now is some sort of sensor that can detect when you're driving under bridges and whatnot and have it reduce the output of the Tx until you get static.
Nice to know you have the fire extinguisher close in case this project goes bad.
I am so pumped about the cable modem teardown thingy. Looks really interesting!
9:19 wow the new version of Fallout is looking amazing
Ben,
I know this comment is ~2 years late, but those Superpressure fittings are really nice to use in extreme pressure set-ups. I look forward to seeing what you come up with for your extreme pressure chamber. This is the second time that I've watched this video, so I hope that I didn't write the same comment a year or two ago!
I saw this video at random. I found it very cool but over my head. I build cars and trucks and have three with original am radios. I would love to hear music like that come from them. thanks
This channel is pure goodness.
Thanks a lot for the time you take to do these video.
Wow, so you're really giving the anodizing thing a shot! I hope it works! You probably ran into the paper below already, but in case you didn't, I think it clarifies quite a bit about the process. Great video, btw -- I didn't know AM modulation could be this simple.
G.E. Thompson, "Porous anodic alumina: fabrication, characterization and applications", Thin Solid Films 297 (1997) 192-20.
Great project. Love the MP3 FM radio. Thanks for the tip. I would put a simple pi filter on the output of the oscillator to knock down any harmonics. I know its low power. But, if it can get you into trouble somehow, it probably will. Or not. That loop through junction means you are broadcasting to nearby cars from the truck's antenna. Just thinking out loud.
Glad to have you back Ben!
I'd say be careful to not interfere with other people's radio when transmitting, especially if you have harmonics, but from the sounds of it you'd just be giving them better radio to listen to anyway! :) Nice explanations.
RimstarOrg it's only powerful enough to work from a few feet away. It wouldn't even work to the cat next to you at a stop light. otherwise, it would be illegal.
How many cars with AM will there be on the road?
That's not the problem, but interference with other appliances or electronic equipment.
ricarleite A lot will depend upon how much of the oscillator's square wave remains, and hence the harmonics, though I would expect the transformer to largely smooth that out into much more of a sine wave. One will want to ensure that they are well within the emissions limits, both power and purity wise, for unlicensed transmitters (FCC part 47 IIRC) though it is likely fine if the maximum swing is a volt or less (but I haven't done the math either, nor do I know the total impedance to make the calculation properly).
I would likely be more concerned with the DC-DC converter in his truck (the silver module sitting atop the speaker) as I know they produce a lot of RFI as I use one to produce the 19V I need to run a pair of 27" HD monitors for my amateur radio shack where everything runs entirely off of a large 12V battery bank. I had to include a good deal of filtering to clean up its switching transients in the LF through HF brands as well as some LC ringing up in the VHF range at around 80MHz and I could pick up the emissions on my dual band general coverage HT from several tens of feet away. But after filtering it is absolutely quiet now with no detectable RFI escaping my filter and chassis and has worked beautifully.
Mauro Tamm most car radio actually no one ever use it though
Your oscilloscope is remarkable. Quite the resolution!
Have you had a chance to play with the Chronos?
Yes. It is fantastic! I've posted a couple short vids to twitter, but will wait until the Kickstarter for a full RUclips video. I saw that you have one as well -- your high-speed bullet footage must be really great!
I started using it the day after I got it, even before I got the batteries for it. I didn't realize the little cap on the body was an ADAPTER so I shot everything without it. I asked David why I could ONLY focus on stuff when the lens was zoomed all the way. lol I thought the lens was broken because the one he sent had a dent. I'm eager to see what others can do with the camera.
TAOFLEDERMAUS holy shit. Fancy seeing you here. Love your channel.
Simply wonderful .You are, quite possibly, the most amazing person I have come across in my years internetting.
That is SO CREEPY, when you showed the picture of your truck, what went through my mind was moonlight serenade, then you played it to test your transmitter. Ugh I have goosebumps now.
I really enjoyed the AM radio project Ben! Can't wait to see what you do with that pressure chamber!
You can use a low pass filter to round off the square wave. In some cases it may also benefit from an attenuator.
Great video, and as if you didn't have enough awesome projects going, here's my idea for one. Photomultipliers aka night vision goggles.
Or a far-infreared (thermal) camera!
There are commercial option for this, maybe not as fun as making one from scratch but much more accessible for people who aren't operating at the upper end of the skill curve. It's called SSTran. I use it to broadcast Old Time Radio MP3s through my restored wooden radios.
if your only using one channel out of the mp3 player module, stereo audio will sound missing/hollow -
i modded one in to a flight remote control, with speakers replacing the sticks, they're great, got one with bluetooth built in too.
I'm really looking forward to seeing your high pressure experiments.
Great job, bro. I love the minimal part count.
I threw together a transmitter like that one Friday afternoon, when I needed to trace a cable inside a wall. You can just couple the signal into the live wall socket or whatever with Y caps. I think I used a 555 to create the modulating tone for the oscillator module.
You need to mix in some old-timey radio advertisements and announcer breaks with the music mp3 files to really get that 30s AM radio feel. Maybe some Roosevelt fireside chats to listen to?
n17ikh I wonder if there are internet stations for that. Anyone know?
These MP3 / FM modules are also able to play PCM WAV files at 44,1Khz 16 Bit. So you're not limited to to MP3 / WMA and FM Radio. You could play linear PCM WAV files from the SD card and USB port.
the problem with the inline setup you have there is that the signal wont just go into your radio but will also be radiated back up the antenna lead and out of the antenna
Cool! You should add some mp3 tracks of old news broadcasts. That would really freak out your passengers
Great project! (The truck's pretty boss, too). You should set it up so the AM-P3 transmitter turns on/off with the radio itself. First solution that comes to mind is a relay in series with the radio's VBAT line. Also, I would like to see more about the radio restoration itself (or was that covered on one of your other media outlets?)
I love the truck!! Back in the days when vehicles had style ;-)
That anodizing idea is pretty neat, but I have an even better suggestion: experiments at my University have shown that superior adhesive joint bond strength is obtained by boiling the aluminium in MilliQ water. This creates an even more columnar topography and suits adhesive bonding much better than any other surface treatment out there. the only reason it isn't used widely is that industry will struggle to keep contaminants out of the process and ultra high purity water.
They never told me this video would feature so much win. Very cool
Funny deja vu for me: I also made such an AM transmitter a long time ago but used an NPN transistor and resistor at the output for the modulation. Never thought that those were even stable when modulating the supply directly.
I've played with this oscillator-can-as-a-transmitter idea a fair bit,and it actually works fairly well. There's a circuit with an LM386 to modulate the power to the oscillator can,also. It can be tricky to find the oscillators in 'useful' frequencies though. (unless your local AM market is completely dead,and 1000khz is clear.)
Something like this: s10.postimg.org/ji5u5f7l5/lm386final.jpg
@@PhattyMo Can I kindly ask you to re-upload that image?
I am really interested in that high pressure stuff. can't wait to see what can be done with that.
That Peltier device project look pretty exciting. It would be awesome if you could give an overview of how they operate.
you never disappoint especially since you leave us wanting more and the about a month wait. I don't mind it's worth it to see cool projects like yours. Also with the gecko tape have you gotten any adhesion or just abnormally low adhesion? I had an idea to make my own by focusing a dot matrix onto photo resist, etching copper, and casting that. I would try that I'd the anodized aluminum doesn't work but you seem like you know much more than I do about this.
this project is really nice, gets me in the mood to play with antennas and tv signals again. haha
SDR gets me like that every few months. I'm struggling to not get a hackRF or Yardstick atm.
You made my brain ache recalling those lessons from too long ago! Thank you :)
So excited to have you back Ben!
its been forever, glad to see your videos again :)
Damn I love this channel, that truck looked mint too, looking forward to the upcoming content.
A wonderful setup for a beauty of a truck. Thanks for posting.
Fantastic Ben! If you ever decide to run for president, your slogan could be "Make am radio great again" 🎶🤓
Very wise keeping a fire extinguisher in a any classic car! they can and do catch of fire from time to time. I observed a 1950's corvette burning up due to an electrical issue. It could of been prevented.
I have an old Philco cabinet that is crying out for this solution. Thanks!
@AvE will love the high-pressure stuff...
Yay more cool projects. I always enjoy watching your videos, both the interesting projects and wonderful explanations.
Ben that truck is BEAUTIFUL!
The LM324 has an output voltage range of 0 to V-1.5, and the input high is V-2. Since you set the gain to 2 and the input voltage swings around 1.5v, I think you're probably losing some modulation, the modulation is uneven, and the oscillator drive is a bit low. The input is railing at 3v, but after amplification, the 3v is 3.5v and the 1v input is 2v output, leading to about 1.5v of total modulated bandwidth and an asymmetric amplitude. You might want to use an adjustable regulator with a 6.5v output so that you can get full modulation.
You are correct. I had actually used an LM78L09, and only remembered it as a 5V. This is one problem with building something, then only getting time to make a video a month later :)
Absolutely LOVE, LOVE, LOVE that truck. Awesome.
that old truck looks sweet :)
Absolute delight watching your videos Ben if you are ever in London doing a demo I will be 1st in the line.
really excited to see the high speed photography!
You should download some recorded broadcasts of old AM radio dramas to put on that SD card!
This is the coolest idea. I was going to hack my old radio and wire an MP3 player with old recordings but I love using the radio exactly as it is so I'm going to try this. Thanks for sharing your ideas. Great truck by the way also.
Wow, that's a really cunning circuit. I bet you could capacitive couple to the adjust pin of an LM317 or the like to an audio signal. Then you wouldn't need the transformer (for that circuit) or need to hack the mp3
that high-speed camera is the same one as what TAOFLEDERMAUS recently got
Yip and I think a few other channels I'm subscribed to (can't remember who atm it IS 5:20am. Maybe the backyard scientist? )
This guy is doing a good job of getting his products into sight.
I understood very little of what you said (I'm a mech tech, electronics mean little to me) but it all looks VERY cool!
Ben, I'm looking forward to all the upcoming projects, especially high-pressure hydraulics and gecko tape!
You, fine Sir, are every bit as AMAZING and talented as God created you to be, God bless you and thank you for these superb works of passion. :)
what a fascinating and we'll described vid, most enjoyable! and I certainly am jealous of that little lorry! thanks for sharing.
That is so cool. I wish I had that set up in my 51 Chevy. 😎
Finally! Hoping to see much more videos!
good project! i have a very powerful AM station close to me (80km) it transmits at 15kW so it has no problems reaching me.
Excellent build! I love the idea of AM radio over you classic car!
Good work Ben, you and Mr Carlson are my fav always look forward to your new vids.
Kind regards from New Zealand.
Paul R
ZL2CIT
WOW. Love the science but have to say that truck is really great. Love to see more on that.
Really nice project! You probably should add some input filtering. Car power usually has quite a bit of spikes from inductive elements ranging far outside 12 V. This kills the circuit.
Vintage truck retrofited with mp3 player, vintage electronic microscope retrofited with slow scan video capture computer, you have the perfect life.
wow Ive came with a really great idea of anodizing Aluminium fo geko tape!
made my day
Very nice. Would love to see those projects you mentioned.
what application would one need 150kPSI enough to make a dedicated gauge?
The view with it playing from the truck just had me thinking 'Strait outa fallout'. lol
For high speed USB I'd hit up CNLohr. He's been messing around with USB and ESP's lately.
I LOVE THE MUSIC YOUR PLAYING I TYPE IN ALL CAPS BECAUSE OF MY BAD EYESIGHT
Man, that is just plain cool! Love it! Love the truck too!
you could hook up an arduino to a pot-meter and make the MP3 player skip through random numbers of songs (pressing next multiple times) simulating changing channels :)
Great I did something like this housed in an old Tannoy wooden fretted speaker box for old time music.
Waaaait, it just struck me. You must know Jeri Ellsworth! A video collaboration would be nice, but unfortunately i don't have a specific topic in mind. I recall she used to do things like hand-make a transistor on her channel, which is not too dissimilar to the kinds of things you do.
Watch any diy/hack type channel long enough and you'll see that black gooseneck ikea lamp (background at 11:20). I've got two on my soldering bench.
Nice truck and great idea on the Am modulator !
I'm excited to watch the video on the cable modem teardown! I know a bit about the network and protocols used, but the hardware/firmware side of things is a mystery to me. Are you planning on taking a low-level approach via assembly language when discussing the firmware, or will it be more of a high-level discussion?
As always, your channel continues to amaze. Thanks for sharing your work with us. :)
This channel never cease to amaze me. Thank you for the efforts you put it these videos. Oh, and great pick-up btw. ;-)
Anodized aluminum for 'gecko tape'....might be a good place to start, you can control the anodizing quite a bit.....